D.21
Date Code 20170814
Instruction Manual
SEL-700G Relay
DNP3 Communications
DNP3 Documentation
➤
Variation 246-RID setting
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Variation 247-RID setting
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Variation 248-Serial Number
Variation 249 shall contain the DNP subset and conformance, “2:2009.”
Variation 250 shall contain the product model, “SEL-700G Relay” and
variation 252 shall contain “SEL.”
Binary Inputs
Binary Inputs (objects 1 and 2) are supported as defined by Table D.9. The
default variation for both static and event inputs is 2. Only the Read function
code (1) is allowed with these objects. All variations are supported. Object 2,
variation 3 will be responded to, but will contain no data.
Binary Inputs are scanned approximately once per second to generate events.
When time is reported with these event objects, it is the time at which the
scanner observed the bit change. This may be significantly delayed from when
the original source changed and should not be used for sequence-of-events
determination. Binary inputs registered with SER are derived from the SER
and carry the time stamp of actual occurrence. Some additional binary inputs
are available only to DNP. For example, STWARN and STFAIL are derived
from the diagnostic task data. Another binary input, STSET, is derived from
the SER and carries the time stamp of actual occurrence. Static reads of this
input always show 0.
Binary Outputs
Binary Output status (Object 10 variation 2) is supported. Static reads of
points RB1–RB32, OCX/CCX and OCY/CCY respond with the on-line bit set
and the state of the requested bit. Reads from control-only binary output
points respond with the on-line bit set and a state of 0.
The SEL-700G supports Control Relay Output Block objects (Object 12,
Variation 1). The control relays correspond to the remote bits and other
functions as shown previously. Each DNP Control message contains a Trip/
Close code (TRIP, CLOSE, or NUL) and an Operation type (PULSE ON,
LATCH ON, LATCH OFF, or NUL). The Trip/Close code works with the
Operation Type to produce set, clear, and pulse operations.
Control operations differ slightly for single-point controls compared to paired
outputs. Paired outputs correspond to the complementary two-output model,
and single-point controls follow the complementary latch or activation model.
In the complementary two-output model, paired points only support Trip or
Close operations, which, when issued, Pulse On the first or second point in the
pair, respectively. Latch commands and Pulse operations without a Trip code
are not supported. An operation in progress can be cancelled by issuing a
NUL Trip/Close Code with a NUL Operation Type. Single output points
support both Pulse and Latch operations. See Control Point Operation for
details on control operations.
The Status field is used exactly as defined. All other fields are ignored. A
pulse operation is asserted for a single processing interval. You should
exercise caution if sending multiple remote bit pulses in a single message (i.e.,
point count > 1), because this may result in some of the pulse commands
being ignored and the return of an already active status message. The
SEL-700G only honors the first 10 points in an Object 12, Variation 1 request.
Any additional points in the request return the DNP3 status code
TOO_MANY_OBJS.
Содержание SEL-700G Series
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